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Motor-driven compressor

a motor-driven compressor and compressor technology, which is applied in the direction of positive displacement liquid engines, pumping, lighting and heating apparatus, etc., can solve the problems of reducing the electrical resistivity of liquid refrigerant, deteriorating the degree of freedom of mounting the motor-driven compressor on the vehicle, and deteriorating the degree of freedom of the motor-driven compressor

Active Publication Date: 2016-11-01
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a motor-driven compressor that compresses refrigerant gas. It includes an electric motor, a compression mechanism, a metal housing, a suction passage, a discharge passage, and a check valve. The check valve is opened during operation and closed when the compressor is at a stop. The technical effect of this invention is to provide a compressor that can efficiently compress refrigerant gas and prevent excessive pressure drop during operation.

Problems solved by technology

It is noted that a specific kind of lubricating oil mixed with liquid refrigerant reduces the electrical resistivity of liquid refrigerant.
When such conductive part is immersed in liquid refrigerant accumulated in the housing, the insulation between the conductive part and the housing may be deteriorated.
However, the motor-driven compressor disclosed in the Publication needs extra space in the housing for disposing the extra length part.
The provision of the extra length part increases the size of the motor-driven compressor and, therefore, the degree of freedom of mounting the motor-driven compressor on a vehicle is deteriorated.
Depending on the space limitation in mounting of the motor-driven compressor, the provision of the extra length part may make it extremely difficult to mount the compressor.
In a case of a motor-driven compressor where the extra length part can not be provided due to space limitation, a conductive part tends to be immersed in liquid refrigerant, so that the insulation between the conductive part and a housing deteriorates.
Additionally, when liquid refrigerant is accumulated in the housing at a start-up of the motor-driven compressor, the liquid refrigerant is vaporized in the housing and the pressure in the housing is increased excessively.

Method used

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Examples

Experimental program
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first embodiment

[0018]The following will describe a motor-driven compressor (hereinafter referred to as compressor) with reference to FIGS. 1 through 3. The compressor 10 which is designated by numeral 10 in FIG. 1 is of a scroll type and used for a hybrid vehicle equipped with an electric motor and an engine for driving the vehicle. The compressor forms a part of refrigerant circuit of a vehicle air conditioner. The vehicle air conditioner includes a cooling unit (not shown) as a condenser, a receiver, an expansion valve, an evaporator, as well as the compressor 10, and tubes connecting the above devices.

[0019]As shown in FIG. 1, the compressor 10 includes an electric motor 12, a compression mechanism 11 that is integrated with and driven by the electric motor 12 to compress refrigerant gas and a metal housing 13 made of an aluminum alloy and including a first housing 14 and a second housing 15. The first housing 14 and the second housing 15 are joined together at the inner ends thereof by means ...

second embodiment

[0047]Meanwhile, refrigerant that is liquefied in the discharge passage D flows into the discharge space in the second housing 15 from the outlet 20. The compression mechanism 11 is also of a scroll type, so that no liquid refrigerant in the second housing 15 can pass through the compression mechanism 11 to reach the first housing 14 (or the electric motor 12). In other words, liquid refrigerant flowing into the second housing 15 from the outlet 20 can be prevented by the compression mechanism 11 from flowing into the first housing 14.

[0048]In the second embodiment, the provision of the suction check valve 51 in the suction passage S can prevent liquid refrigerant from flowing into the first housing 14 without providing a discharge check valve such as 52 in the tube 24 of the discharge passage D. The compressor 70 dispenses with the discharge check valve 52 of the compressor 10, so that the compressor 70 can reduce the number of parts as compared with the compressor 10 having the d...

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PUM

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Abstract

A motor-driven compressor includes an electric motor, a compression mechanism driven by the electric motor so as to compress refrigerant gas, a metal housing accommodating the electric motor and the compression mechanism, a suction passage communicable with interior of the housing wherein refrigerant gas flows through the suction passage, a discharge passage communicable with the interior of the housing wherein refrigerant gas discharged from the compression mechanism flows through the discharge passage and a check valve that is provided in at least one of the suction passage and the discharge passage, opened while the compressor is in operation and closed while the compressor is at a stop.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a motor-driven compressor that has in the housing thereof an electric motor and a compression mechanism compressing refrigerant gas by the rotation of the electric motor.[0002]Generally, a motor-driven compressor accommodates in a metal housing thereof an electric motor and a compression mechanism compressing refrigerant gas by the rotation of the electric motor. This kind of motor-driven compressor is connected to an external refrigerant circuit and refrigerant gas flows in the housing and through the compression mechanism during the operation of the motor-driven compressor. When the motor-driven compressor is at a stop, refrigerant gas is cooled and liquefied and the liquefied refrigerant (hereinafter referred to as “liquid refrigerant”) tends to be accumulated in the housing of the motor-driven compressor. Liquid refrigerant contains lubricating oil. It is noted that a specific kind of lubricating oil mixed with li...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F04C28/28F25B31/02F04C29/12F04C28/06F04C23/00F25B41/04F04C18/02
CPCF04C28/28F04C23/008F04C28/06F04C29/126F25B31/026F25B41/043F04C18/0215F04C2270/701F25B2500/26F25B2500/27F25B41/22
Inventor ADANIYA, TAKU
Owner TOYOTA IND CORP